Hardcoded IParser.h max_depth = 1000 should be configurable.

This pull request https://github.com/yandex/ClickHouse/commit/0a9787c7f3eb295ed94c7a6d35fe702ad59648e3#diff-7ecb930104742be8bbaf5b53aa1f00deR60
 
`uint32_t max_depth = 1000;`

broke some existing working SQL.

https://t.me/clickhouse_ru/115334

$ wc amp_task.sql
      60    4122   57661 amp_task.sql

